Same issues here, did anybody found a solution yet? I think is something related to running wine in a 64 bits enviroment since it doesn`t fail at all when im in 32 bits gentoo, same computer, same setup using this guide.
Are all of you with this page fault runinng 64 bits?

I've got around the page fault in 64bits arch, but got a blank once the video started. So, I will dig a little more !

Here what I did. First, I went with the "chroot" solution, by installing a 32bits linux inside my 64bits installation. It worked, but my soundcare wasn't detected, so I couldn't go anyfuther with Joost. And then, I figure out that I should simply compile Wine in 32bits. So, I did a new compile, but add some flags to "./configure":

NOTE: I changed the kumbayo prefix to "kumbayo32", so be aware ! You will have to change your launch script for Joost to reflect that change.

Once I did that, Joost launched, I sign in, see the starting screen, and when the introduction video launched, I got sound, but no video. So, I will try to get around this problem to, if someone can help, it would be very nice !!!

I've googled a little bit, and I red somewhere that the "black screen" may have to do with my propriatary nVidia drivers. So, maybe the opensource version, or the latest beta drivers from nVidia may works. I will try it ... hoping I will not mess up my system I'll give feedback about it as soon as I got result !

Glad that I could help pijaiu !!!

[Few minutes later]

It works with the latest nVdiai drivers (BETA).

But now, my problem is that it is very laggy ... someone else had that problem ?

If you did all that and still have the blackscreen, maybe check if the latest nVidia drivers are really loaded (good version). But else, I couldn't tell you more, it worked for me as soon as I've installed the nVidia drivers.

Regarding the wine: Unhandled page fault on execute access in 64 bits Gentoo i just found the solution. Everything goes fine when you pass noexec=off noexec32=off to the kernel before booting.
Hope it helps.

Now i can roun Joost fine until passed the login screen, im stuck with the blank screen and i found i cant upgrade the nvidia drivers because the newest beta version does not support my gpu

Thats enough Joost for me. I cant (and i dont want) to buy a new vga card, so im going to have an eye on this post until someone get rid of the blank screen...